Today Amazon has aÂ wide selection of K’nex setsÂ marked down by 50% instantly. Â Shipping is free on orders of $25 and over. Â ThisÂ Nintendo Mario Kart Wii Track Pack is on sale for $13. Â There are 24 pieces of track are included in the set, as well as a buildable Mario figure and a trophy item from the game.I know my kids love some K’NEX! How about yours?